<p>Transversely isotropic unsaturated loess is widely distributed in the Loess Plateau in northwestern China. Its water-holding characteristics directly affect the stability and safety of engineering structures, such as foundations and slopes. During deposition, loess depositional planes exhibit varying inclination angles relative to the horizontal plane, which can influence the distribution and migration patterns of soil moisture. To investigate how different depositional angles influence the water-holding characteristics of transversely isotropic unsaturated loess, this study used a pressure plate apparatus to perform six sets of soil-water characteristic curve (SWCC) tests on undisturbed and remolded loess. SWCCs were obtained for both types of loess. The results indicate that, under identical suction conditions, the volumetric water content of the soil samples decreased as the depositional angle increases. The SWCC of undisturbed loess exhibits greater dispersion across angles than that of remolded loess and has superior overall water-holding capacity. After compaction treatment, the water-holding capacity of remolded loess decreases overall. Fitting analysis of the experimental data using the VG model revealed that the depositional angle influences the air entry value and dehydration rate of the loess. A conversion relationship was established between the depositional plane coordinate system and the original coordinate system, and a three dimensional rotation matrix was derived. Through coordinate system transformation, the depositional plane parameter was incorporated into the VG model, yielding a modified VG model that considers the depositional angle. Preliminary validation demonstrated satisfactory results, providing a reference for engineering designs involving loess foundations and slopes.</p>